Dust arrester



Sept. 10, 1935. c. B. SCHNLEIBLE ESTER DUST ARR Filedsept. l, 1932 3 Sheets-Sheet 1 cZneiZ/e Sept. 10, 1935. 'c. B. SCHNEIBLE -\DUST ARRESTER Filed Sept. 1, 1932 3 Sheets-Sheet 2 I Jfzvenfir/ i tic/ 172311529 3 Sheets-Sheet 3 5 /fl//w// M///// Ill lllllllllll Sept. 10, 1935. c. B. SCHNEIBLE DUST ARRESTER Filed Sept. 1, 1932 H l 7 ZZZ 6 l i m fl J C'Zaude Patented Sept. 10, 1935 UNITED STATES PATENT OFFICE 6 Claims.

This invention relates to a dustarrester and more particularly to apparatus in which cloth tubes are employed as a filtering medium.

Anobject of the invention is to provide dust 6 arresters in which the tubular cloth members have a greatly increased filtering orarresting surface. Another object is to provide improved means for shaking or vibrating the cloth tubes to remove the dust collected thereon. A further object is to provide means for anchoring the lower ends of the inner tubes while at the same time breaking up direct currents of air which would otherwise work injury to the cloth walls of the tubes. Other specific objects and advantages 5 will appear as the specification proceeds.

The invention is illustrated in its preferred embodiment, in the accompanying drawings, in

which I Fig. 1 is a broken vertical sectional view of apparatus embodying my invention; Fig. 2, a broken detail sectional view, the section being taken as indicated at line 2 of Fig. 4; Fig. 3, an enlarged top plan view of a tubular dust arrester, the supporting beam being removed; Fig. 4, a transverse part-sectional view, the section being taken as indicated at line 4 of Fig. 2; Fig. 5, a modified form of tubular dust arrester embodying my invention; Fig. 6, a detail part-sectional view of the lever and spring. construction; and Fig. 7, a broken vertical sectional view of a modified form of the invention.

In the illustration given, A designates a casing; B designates tubular cloth members supported within the casing; C designates shaking'or reciprocatingmeans; and D designates a fan on the outlet duct from the casing A.

The casing A may be of any suitable construction. In the illustrationgiven, it is shown of a somewhat standard design, the lower walls of the casing being converged to form a hopper A with an outlet pipe A The outlet pipe A for the collected dust may be controlled by a suitable valve Ill. The casing A is provided at its lower side with an inlet duct, H and at its upper side 5 with an outlet duct l2. Just above the inlet pipe I l is a partition or tube sheet l3 provided with a series of perforations l4. Around each of the openings H is a collar .or thimble l5 provided at its upper end with a bead l6.

0 In order to provide a baille. which will prevent injury to the tubular'members B by entrained I large dust particles and in order to provide an anchor for .the inner tube ofeach of the members B, as will be later described, I prefer to form intcgrally with each of the collars l5 the cross plates or baflies II. The bailles H, at their point of junction, form a cylindrical boss H3 in which isthreadedly secured a hookl9.

Tubular cloth arresters of the type heretofore in use have been formed with single walls and in 5 this respect the cloth area available for filtering air has been definitely limited. I have found that the cloth area of the tube can be greatly increased without increasing the size of the tube, while at thev same time, producing a regular and uniform rate of fiow of the air. As illustrated more clearly in Fig. 1, my improved tube B is provided with outer walls and inner walls 2|. Preferably, the inner Walls 2| are tapered inwardly so as to form an inverted-cone shaped in- 15 ner tube. A pan 22 provided with a stoppered opening 23 is employed'to'close the lower end of the tube. To hold the pan in position, a circular tie member 24 may be used. At the lower end of the tube is secured aring 25 about which is se-' 20 cured the loop member 26. As shown more clearly in Fig. 2, the anchor hook I9 engages the loop 26 and serves to hold the inner tube in centered position within the outer cylindrical wall 20. The outer wall 20 is fastened at its lower end to the 2 collar 15 by means of a strap 21 or by any other suitable means.

In order to support the tube B in the vertical position illustrated in Fig. 2; there is shown a ring 28 which extends between the folded walls 20 and 2|, the ring 28 being engaged on diametrically opposite sides by supporting springs 29. The springs 29 are in turn carried by the cross rod 30 which is fixed to the vertical shaft 3|. The shaft 3| extends through an opening in the supporting cross beam 32 and is maintained therein by the clamping collar 33.

The shaking or agitating mechanism C may be of any suitable form or construction. I prefer, however, to employ mechanism which will serve to rotate and whip'the bag B successively in opposite directions, thus serving to stretch and fiex the bag and thereby loosenthe' hold of the dust thereon. In the illustration given, this result is accomplished by securing to the shaft 3| a lever arm 34 which is held by a spring 35 normally in the position shown in full lines in Fig.

, 3. The spring 35 has one end secured to the lever hub and the other to the cross beam 32. A reciprocating shaft 36 is provided with a pin 31 which engages the end of the lever arm 34 and slips over it at the end of the swing. When the shaft 36 is reciprocated, it carries the lever arm 34 to the positions shown in dotted lines in' Fig. 3. Any suitable means for reciprocating shaft 36 may be employed. As illustrated more clearly in Fig. 1, the shaft is provided at one end with a yoke 38 which is actuated by the cam 39 carried by shaft 40.

The fan D is shown connected with the outlet duct l2. It will be understood that the fan may be placed, if desired, in the inlet duct I l or elsewhere to force the air through the apparatus.

In the operation of the apparatus illustrated, the air is drawn through the inlet pipe ll into the enlarged hopper A. In the hopper A, the velocity of the incoming air is greatly reduced so that the heavier particles of dust'drop into the cone-shaped bottom of the hopper. lighter particles are carried by the airinto the tubular members B-where the velocity is still further reduced. The air entering one of the cloth tubes B may escape through the outer wall 20 or the inner wall 2|, leaving the dust particles on the filtering walls. In the ordinary type of cloth tube, in which no inner tube member is employed, the velocity of the air diminishes as the air rises in the tube, this being due of course to the escape of a large volume of air through the lower portion air space between the walls decreases uniformly toward the upper portion of the bag'so as to compensate for the loss of air through the outer and inner Walls. In this manner the air is caused to flow at a regular or uniform rate up the length of the tube and the efficiency of the cloth walls in arresting dust particles is thereby increased. The cleaned air escaping either from the outer Wall 20 or through the inner wall 2| and out through the opening at the top of the cloth member B, is drawn through the casing A to fan D.

In removing the dust from the cloth members B, the shaft 40 is rotated so that cam 39 engages a yoke 38 and reciprocates rod 36. The pin 31 carried by rod 36 engages the end of lever 34 and ,bag B rapidly in opposite directions, stretching the cloth in one direction, then loosening it and then stretching it in the opposite direction. This operation frees the bag from the dust collected thereon and causes it to drop. The dust collecting within the inner tube may be discharged by removing plug 23 in the pan 22.

In the modified form of bag or tube illustrated in Fig. 5, the tapered walls of the bag are folded within the outer wall 20 to provide two inner walls 4| and. 42. If desired, the number of'walls may be further increased by following the same plan. At the upper end of the wall 42 is secured a closure member 43 equipped with a metal eye 44 which may be utilized to support the reduced end of wall 42 in elevated position.

In the modification illustrated in Fig. 7, I have,

provided a construction somewhat similar to that shown in Fig. except that a steel wall is substituted for one of the cloth walls. Carried by the cross strips I! of the collar 15 is a circular plate 45 which is provided on its inner side with a collar flange 46. The flange 46 is provided at its top with a head 46. Carried by the plate 45 is a tubular steel wall 41 which is provided at its top with a bead 41*. The outer fabric wall is The - ported therein, a vertically supported shaft, conformed by securing the lower end of the outer cloth tube 48 to the collarl5 by strap 49. The upper end of the tube 48 is turned inwardly and secured against the steel wall 41 and below bead 41 by an inner strap 50. The inner tube or bag 5 5| has its lower open end secured to the collar I 46 by the strap 52. If desired, fabric-supporting strips 53 may be employed'for supporting the cloth tubes 48 and 5| in raised position.

The advantage of the construction shown in Fig. 7 is that the flow of air is outward with respect to each cloth wall'so that the cloth is maintained in distended position. In the filtration of certain types 'of material, it is desirable for the air to pass outwardly through the cloth, the filtering operation being more eflicient when the cloth is distended than when it is partially collapsed as a result of the inward flow of air.

The non-porous wall provides a support for the bags as well as bringing about the outward flow of air.

While in the illustration given, I have shown a single tubular member which has portions folded within itself to provide inner walls, it. will be understood that my invention contemplates the forming of nested walls in other ways and from separate pieces of cloth. Also, by the use of the term tubular in the specification and appended claims, I mean not only a cylindrical fabric body, but also tubes of various shapes or forms.

The foregoing detailed description has been given for clearness of understanding only, and no unnecessary limitations should be understood therefrom, but the appended claims shouldbe construed'as broadly as permissible, in view of the prior art.

I claim:

1. In dust arresting apparatus, a casing, a tubular cloth member supported therein and open at its lower end, the upper portion .of said member being tapered inwardly and said upper .portion being folded within said lower portion to provide an inner filtering wall, closure means for the lower end of said inner wall, said closure being provided with an opening, and means controlling said opening to permit the removal of dust from the inner wall.

2. In combination, a casing, a cloth tube supported therein, a vertically supported shaft, con- '0 necting means between said shaft and said tube,

a lever secured to said shaft, spring means urging said lever toward one position, and reciprocating means releasably engaging one end of said lever and cooperating with said spring for rotating the tube in one direction and then in the other.

3. In dust arresting apparatus, a tubular cloth member open at its lower end, the upper portion of said member being tapered inwardly and being folded within said lower portion to provide an inner filtering wall, and movable closure means controlling the removal of dust from the lower end of said inner wall.

4. In combination, a casing, a cloth tube sup- 55 ported therein, a vertically supported shaft, connecting means between said shaft and said tube, alever secured to said shaft, resilient means urging said lever toward one position, and means intermittently engaging one end of said lever and cooperating with said resilient means for rotating the tube in one direction and then in the other.

5. In combination, a casing, a-cloth tube sup:

necting means between said shaft and said tube, a lever secured to said shaft. and means engaging said lever for rotating the tube first in one direction and then in the other.

6. In combination, a casing, a cloth tube supported therein, a vertically supported shaft, connecting means between said shaft and said tube,

said means including spring elements, spring means urging said shaft toward one position, and means intermittently rotating said shaft against the force of said spring and cooperating with said spring for rotating the tube in one direction and 5 then in the other.

CLAUDE B. SCHNEIBLE. 

